439969 has 2 divisors, whose sum is σ = 439970. Its totient is φ = 439968.

The previous prime is 439961. The next prime is 439973. The reversal of 439969 is 969934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439569 + 400 = 663^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 439969 - 2³ = 439961 is a prime.

It is a super-2 number, since 2×439969² = 387145441922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (439961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219984 + 219985.

It is an arithmetic number, because the mean of its divisors is an integer number (219985).

2⁴³⁹⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

439969 is a deficient number, since it is larger than the sum of its proper divisors (1).

439969 is an equidigital number, since it uses as much as digits as its factorization.

439969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 40.

The square root of 439969 is about 663.3015905303. The cubic root of 439969 is about 76.0572629380.

The spelling of 439969 in words is "four hundred thirty-nine thousand, nine hundred sixty-nine".